Google Gadget for a PayPal button with an amount text input. Meant to be used on Google Project Hosting.

paypal-gadget.xml

<?xml version="1.0" encoding="UTF-8"?>
<Module>
<ModulePrefs title="PayPal gadget" author="Stefan Sundin" width="400" height="35"></ModulePrefs>
<UserPref name="business" datatype="string" default_value="8727MAF7NTYRE" />
<UserPref name="item_number" datatype="string" default_value="Donation" />
<UserPref name="amount" datatype="string" default_value="$5.00" />
<UserPref name="return_url" datatype="string" default_value="" />
<UserPref name="return_text" datatype="string" default_value="" />
<Content type="html">
<![CDATA[

<style type="text/css">

body {
	font-family: "Droid Sans", sans-serif;
	font-size: 13px;
	overflow: hidden;
	text-align: center;
}

form {
	margin: 0;
}
input {
	margin: 5px;
}

#amount {
	width: 120px;
	padding: 8px;
	box-shadow: 0px 1px 3px rgb(240, 240, 240) inset;
	border: 1px solid rgb(198, 198, 198);
}
#amount:focus {
	box-shadow: 0px 1px 3px rgb(238, 238, 238) inset;
}

#submit {
	padding: 4px 15px;
	border-radius: 15px;
	box-shadow: 0px 0px 3px rgb(204, 204, 204);
	background: linear-gradient(rgb(149, 249, 149), rgb(148, 238, 148)) repeat scroll 0% 0% transparent;
	border: medium none;
	color: rgb(38, 38, 38);
	outline: none;
}
#submit:hover {
	box-shadow: 0px 0px 5px rgb(170, 170, 170);
	cursor: pointer;
}

</style>

<form method="post" action="https://www.paypal.com/cgi-bin/webscr" target="_blank">
	<input type="hidden" name="cmd" value="_xclick">
	<input type="hidden" name="business" value="__UP_business__" />
	<input type="hidden" name="item_number" value="__UP_item_number__" />
	<input type="hidden" name="return" value="__UP_return_url__" />
	<input type="hidden" name="cbt" value="__UP_return_text__" />
	<input type="text" name="amount" id="amount" value="__UP_amount__" placeholder="Donation amount" />
	<input type="submit" id="submit" value="Donate with PayPal" />
</form>

<!-- Developer notes:
https://gist.github.com/stefansundin/6540861

Example use (Google Project Hosting):
<wiki:gadget border="0" url="https://gist.githubusercontent.com/stefansundin/6540861/raw/paypal-gadget.xml" up_business="8727MAF7NTYRE" up_item_number="AltDrag" up_amount="$5.00" up_return_url="http://stefansundin.com/thx" up_return_text="Learn why you just became awesome" width="400" height="35" />
<wiki:gadget border="0" url="https://gist.githubusercontent.com/stefansundin/6540861/raw/paypal-gadget.xml" up_business="8727MAF7NTYRE" up_item_number="AltDrag" up_amount="$5.00" up_return_url="http://stefansundin.com/thx" up_return_text="Learn why you just became awesome" width="200" height="80" />

Note: return url is limited to 1024 characters.

TODO: Add lang parameter? name="lc"
-->
]]>
</Content>
</Module>